Brush-holder for dynamo-electric machines.



7 LE. WEBSTER.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES. APPLICATION FILED SEPT. 25, 1905.

930,006. Patented Aug. 3, 1909.

WITNESSES NVENP @mflw physical shown in cross;section nea JOHN E. WEBSTER, OF PITTSBURG, PENNSYLVANIA,

& MANUFACTURING COMPANY, A

rm; l iF l on at strum CORPORATION OF PENNSYLVANlA.

BRTUSK HOLDEB FOR DYNAMO-ELECTRIC TitAGHENES.

Application filed. September 9 all whom it may concern: Be it known that I, JOHN EJWnnsrnR, a citizen of the United States, and a resident of Pittsbur in the county of Allegheny and State 0% Pennsylvania, have invented a new and useful Improvement in Brush- Holders for Dynamo-Electric Machines of which the following is a specification.

My invention relates to brush holders for dynamo-electric machines and has special reference to carbon brush holders of the spiral spring type that are adapted for rail- Way vehicle motors.

The object of my invention is to provide a spring guide for brush holders of the above-mentioned type that shall be simple in design and easy of application and that shall efiectively maintain the several coils of the spring in concentric relation Without materially impairing their flexibility.

order to obtain cfiicient action and constant; pressure from a spiral spring such as is ordinaril' employed in connection with carbon-bruso holders for dynaino-electric machines, it is desirable to maintain a substantially concentric relation between the turns of the spring. l secure this result by attaching the outer end oi? the spring to the brush holder arm and its inner end to a rotatably adjustable hollow shaft or sleeve that substantiallv concentric with the turns of the spiral and by providing a suitable curved guide for the outer turn of the spiral portion of the spring.

lYhile the best results are secured by comliming the atoresaid spring arrangement with suitable means for maintaining a concentric relation between the turns of the spiral, the spring guide is not essential to the improved operation of the brush holder and a materialadvantage over the brush holders of the prior art ina y be secured by connecting the brush-actuating arm or 1nemher to the inner cud of the spiral where the tendency for the adjacent turns to become eccentric is minimized on account oi the pro 'icrties of the spring.

The single figure of the accompanying drawing is a side elevation of a brush holder constructed in accordance with my invention, the brush holder bracket arm being 1 the point of support, to disclose an admutagcous method of mounting and insulating the same.

Referringto the drawing, the brush holder Specification of Letters Patent.

25, 1906. Serial No. 280,033.

l'comprises a supporting My 3 of which is arov de through which a carbon brush able contact brush a may slide Patented Aug. 3, race.

arm the extremwith a slot l or other suitlrcely. The

supporting arm 2 sometimes mounted dias in railway t be insulated curcly attached thereto. This is accomplished in the brush holder show of insulating blocks ll, 7. S and \rectly upon the motor frame l l 6 is mounted upon a 10 which may be pr 11 in the drawing by a plurality t). The block suitable ledge or shcl ovided on the motor frame, the relative position of the two he- Babbittmetal, and engages mg toothed surface on the a through which a clamping ject, said bolt being provided sulating sleeve 18 and pro ecting ting determined by a projection it, which 12 in the surtace 13 is is preferably constructed of relatively soft material such a corresg iondrm 2.

The arm 3, is provided with a slot 16 bolt 17 may pro with an 1n tarough the blocks 8 and 9 which are mounted on top of the arm 2 and the blocks which are interposed betweenthe shelf 10. serve to oppose any tendency rotate about the bolt 17 as an ther allow an adjustment to the commutator ledge 10 on the frame.

The toothed cheat V A" by reason or 1. 7 and 6, the arm and no; surtaccs axis and furof the a rm relative the slot, 16.

The insulating sleeve l8 and the insulating blocks 9 and 6 completely insulate the arm 2 from. the bolt 1'? and "from the supporting A brush holder pressure mechanism 1 the arm 2, a sleeve 2?. that 20 which is attached to rotatably mounted thereon and is provided with a l comprises shaft l ratchet wheel 22, and a l sleeve 21 and .18 provided with lengagc the V t spring 25 is coded about the inner extremity engaging a groove 26 in the sleeve l trcmity 2-7 being 1 meat with a hooked projection l tremity 3. A guidcwcb 29 l an integral part of the arm :2, l the extremity l turn of the spring I held substantially in concentrratchet wheel luush-cngaging which is rotatably umuntcd on the a pawl iii to spiral score :21, its iongitu-Ilinal 2-1 and its outer csheld stationary by engage- 28 on the exwhich may be ext ends from 3 and so engages the outer that all ct its turns are is relation to arm to too Ill

Cir

each other and to the sleeve 21. The finger 23 is. provided With a flexible member 30 having an end piece 31 which is held against the outer end of the brush 5 by the pressure of the spring the degree of pressure being adjusted by means of the pawl 24 and the ratchet 22. The engaging surface of tr e ledge 10 may be covered with a layer of Babbitt metal or other similar material so that the supporting arm and its insulating blocks may more ,readily seat themselves when pressure is applied by means of the bolt 17.

Although the spring-guide of my invention is shown and described in connection with a specifio brush holder it may obviously be applied to any other type of brush holder which embodies a sinnlar spring pressure mechanism and I desire that variations in size, form and arrangement of details which do not depart materially from the spirit of my invention shall be included within its scope. i

I claim as my invention:

1. in abrush holder for dynamo-electric machines," the combination With a supporting arm having a brush-holding slot, a shaft mounted on said arm and a spiral spring comprising a plurality of turns of different diameters which surround. said shaft, of a guide Web which is integral with said arm and a portion of which is substantially concentric With said" springshaft and contiguous to the outer turn of the spring.

2. In a brush holder for dynamo-electric machines, the combination with a support ing arm having a brush-holding slot, a shaftmounted on said arm, a brush-engaging finger rotatably mounted on tle shaft and actuated by a pawl and ratchet connection, and a spiral spring comprising a pluralit of turns of difi'erent diameters Which surround said shaft, of a guide web which is integral with said arm and a portion. of which is substantially concentric with said shaft and iscontiguous to the outer turn of the spring.

3. in a brush holder for dynamo-electric machines, the combination With a support iug arm, a shaft mounted on said arm, a brush-enfi agin finger rotatably mounted on the shalt and actuated by a pawl and ratchet connection, and a spring comprising a plurality of turns of different diameters which surround said shaft, said. spring having its inner end connected to said finger and its outer end attached to the supporting arm, of a guide Web for said spring which is integral with said arm and a portion of which is substantially concentric with said shaft.

l. A brush holder for dynamo-electric machines comprising a supporting arm havmg a brush-hold1nv slot, a shaft attached to tably mounted on said shaft and actuated by a pawl and ratchet device, a spiral spring comprising a plurality of turns of dififerent diameters and having a laterally projecting outer end which is attached to projection on said arm and the body portion. of which surrounds said shaft and is connected to the pressure finger, and a guide Web which is integral with said arm and a portion of which is substantially concentric with said shaft.

5. A brush holder for dynamo-ole machines comprising a supporting arm navin a "toothed engaging surface to engage a suitable complementary engaging surface with which the dynamo-electric machine provided, a shaitattached to said supporting arm, a yieldable pressure finger rotatably mounted on shaft and actuated by a pawl and ratchet device, a spiral spring comprising a plurality of turns of dili'erent diameters and having a laterally projecting outer end which is attached to a projection on said arm and the body portion which surrounds said shaft and is connected to the pressure finger, and a guide Web which is integral with said arm and a portion of which is substantial y concentric with said shaft. v

(5. in a brush holder, the combination With a supporting arm having a brush-holding slot and abrush, of a finger that engages the brush, a spiral spring'comprising a pinrality of turns of different diameters and servin to operate the linger, and a curved guide located contiguous to a portion of the outer turi, or the spiral spring for maintaining its convolutions in substantially concentric relation.

7. In a brush holder, the combination with a supporting armhaving a brush-holding slot and a brush,'o: an exposed spiral spring comprising a plurality of turns of difierent diameters, means actiuitcd by said spring to engage and operate the brush, and a curved guide loca ed in proximity to a portion of the outer convolution of the spring and serving to maintain theconvolutions in substantially concentric relation.'

8. In a brush holder, the combination with a brush, of a spiral spring comprising a plurality of turns of diliercnt diameters and having its outer end stationarily secured, means actuated from the inner end of the spring for operating the brush, and a guide for maintaining the convolutions or the spiral spring in si'abstantially concentric relation.

9. In a brush holder, the combination with a brush, of a spiral spring comprising a plurality of turns of difi'erent diameters and having outer end stationarily secured, a ratchet attached to the inner end of the spi'ing, aawl, finger to which the pawl is "attached for effecting operation of the said arm, a yieldaole pressure finger rotabrush, and a guide for maintaining the con lOF/ spring in substanvolutions of the sPiral tially concentric re ation.

10. In a brush holder, the combination with a brush, of'an exposed spiral spring comprising a plurality of turns of different diameters, means actuated by said spring for Operating the brush, and a guide disposed in substantially concentric relation to the cen ter of the spiral springiifid adjacent to a portion of its outerco'nvolution whereby the. i 

